Automatic telephone system



M. E. MALONEY ET AL AUTOMATIC TELEPHONE SYSTEM pril 26, 1949.

Filed Aug. 14, 1945 6 Sheeizs--Sheei'l 1 subs Dk #W5/vrom M E- MALONEVF. F. -sH/PLEV BV April 26, 1949- M. E. MAL.'0|\1EY ET AL 2,468,300

AUTOMATIC TELEPHONE SYSTEM Filed Aug. 14, 1945 y 6 SheelZS-Sheel'l 2 2Hv nea/:Tens sequence u nl n "Ii-'k' III INCOMING PULSE RECEIVING CIRCUIT/200 F/G. Z

A rice/ver April 26, 1949.v M.' E. MALONEY ET AL 2,468,300.

' v AUTOMATIC TELEPHONE SYSTEM Filed Aug. 14, 1945 e sheets-sheet 5SEQUENCE RELYS l I l I III; Il@

Ol/TGOING PULSING CIRCUI T ATTORNEY.

` April 26, 1949.v M. E( MALNEY ET,A| 2,468,300

` AUTOMATIC TELEPHONE SYSTEM Filed Aug. 14,. 1945 6 Sheets-Sheet 4REG/STER .FENDER /7 MARKER u n cuss Mur: CONNECTOR /6 kzzs- L MeMALo/VEV/NVEVTORSE-F. SHI/LEV By WW- ATTORNEY AApril v26, 1949.v M. E. MALONEYETAL 2,468,300

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` A AUTOMATIC TELPHONE SYSTEM Filed Aug. 14,* 1945 6 Sheets-Sheet 6 TOLLCOMPLET/NG MAR/(ER Z0 REA TRANSLATOR l COMMON TRANJLATR! I 32 i J3 I E.MALO/v5? WENO/S F. F. sH/PLEV ATTORNEY Patented pr. 26, 1.949

AUTOMATIC TELEPHONE SYSTEM Martin E. Maloney, Flushing, N. Y., and FrankF. Shipley, TenaIY, N. J., assignors to Bell Telephone Laboratories,incorporated, New York, N. Y., a corporation of New York ApplicationAugust 14, 1945, Serial No. 610,724

14 Claims.

This invention relates to telephone systems and particularly to tollsystems employing automatic switches for completing connections betweencalling and called subscribers and operators.

Objects of the invention are an increased eiliciency in the automaticrouting of toll calls, the minimization of the time required forcompleting such calls, and generally the improvement of the control ofautomatic switching in toll telephone systems.

In extending the use of automatic switching equipment in toll telephonesystems and in enlarging the area within which toll calls may becompleted without the aid of an operator and also in reducing to aminimum the number of operators involved in the completion of built-upconnections through a plurality of toll offices in tandem, theregister-senders used in routing a call must be capable of registeringboth the toll and local oflce code digits. The routing of a through callat a particular toll olilce depends on only the toll code, the routingof a terminating call depends only on the local oce code, and therouting of calls to oflices in toll areas in which there is more thanone inward toll center may depend on both the toll and local oilicecodes. Ii a marker were called in only after the number of digitsregistered equal the maximum number representing both cnice codes, tolland local, the extension of calls which are routed responsive to thetoll code alone would be unnecessarily delayed while the local oice codewas being registered or until time enough had elapsed to determinewhether any further digits would be registered. To seize a marker twice,once at the end of the toll code and again when the local code isregistered if the routing depends on both codes, is also objectionable.

This invention is a telephone system comprising register-sender andmarker controlled switches in which a pretranslator is called in by aregister-sender after sumcient digits have been registered therein torepresent a toll route code.

A feature of the invention is a telephone system comprisingregister-sender and marker controlled switches in which theregister-sender used on an incoming toll call is connected to apre-translator as soon as enough digits have been registered torepresent either a toll or a local ofiice code and in which thepretranslator receives these digits from the register-sender and thentells the register-sender what kind of a marker to use, when to call inthe marker, and what information must be transmitted to the marker. If acall is one which is to be routed directly to the called local cnice,the pretranslator tells the registersender to immediately call in a tollcompleting marker and to transmit to the marker the same digits whichare transmitted to the pretranslator. l'f a call is one for which theterminating toll office is in the same numbering area as that inr whichthe register-sender is located, the pretranslator tells theregister-sender to immediately call in an intertoll marker and totransmit to the marker the same digits which were transmitted to thepretranslator. 1f a call is one for which the terminating toll oihce isin a toll area which is accessible through two or more direct trunkgroups, thepretranslator tells the.

direct group of ring-down or dial trunks is provided, the pretranslatortells the register-sender to immediately call in a toll marker, transmitto the marker the same digits which were transmitted to thepretranslator and tell the marker to use the translator which is commonto a plurality of areas. If a call is one for which the terminating tollcnice is in an area to which there is no direct group of trunks, thepretranslator tells the register-sender to immediately call in a tollmarker, transmit to the marker the same digits which were transmitted tothe pretranslator and tell the marker to use the translator common to aplurality of areas; and the pretranslator further tells theregister-sender to transmit over the selected trunk all of the digitsregistered in the register-sender.

A clear and complete description of these and other features of theinvention will be facilitated by considering a system in which theinvention is embodied, one such system being represented schematicallyin the drawings which constitute a part of this specification. Theinvention is, however, not limited in its application to the system andarrangements shown in the drawing but is generally applicable toautomatic` switching and control systems. Referring to the drawing,

toll oices A and B;

Figs. 2, 3 and 4 represent a register-sender Il in oice B;

Fig. 5 represents a pre-translator I9 in office B; and

Fig. 6 represents marker equipment in omce B.

The system represented schematically in Fig. 1 comprises switches of thecross bar type and is generally similar to that disclosed in the patentto G. V. King, J. B. McKim and O. Myers, No.

2,236,246, granted March 25, 1941. The toll ofc A comprises an operatorposition I2 which includes an operators telephone and key-set, a cordII, jacks Ill and I3, and an outgoing trunk circuit I4. Jack Il] mayterminate a toll recording completing trunk from a local ofilce and wemay assume that one end of cord II has been connected with jack I@ toanswer a call initiated at a local subscribers station. The cord,position and key-set equipment, and the outgoing trunk circuit I4, maybe similar to like equipment and trunk circuits disclosed in the patentto P. B. Murphy, No. 2,288,251, granted June 30, 1942, and the patent toG. Hecht, A. A. Lundstrom and E. R. Taylor, No. 2,332,912, grantedOctober 26, 1943. The incoming trunk circuit I6 and register-sender IImay be similar to the incoming trunk circuit shown in Fig. 6 andregistersender shown in Figs. 23 to 35 of Patent No. 2,382,- 893,granted Aug. 14, 1945 to B. McKim and O. Myers, except that theregister-sender is modied to incorporate therein features of the presentinvention. The marker-connector i8 is similar to the marker-connectorsdisclosed in the aforementioned patent to King, McKim and Myers and inthe aforementioned patent to McKim and Myers except that it is arrangedto provide for the connection of the register-sender to a pretranslatorin addition to providing for the connection of the register-sender to atoll completing marker r afn intertoll marker. The toll completingmarker 2'0 is similar to the marker disclosed in the aforementionedKing-McKim-Myers patent and so also is the intertoll marker 30 exceptthat it includes a plurality of translators, area translators 3`I and 32being individual to the marker 3l) and translator 33 being common to allintertoll markers in oce B. An area translator is provided for an areato Which there is a large volume of traiic and a lplurality of directtrunk groups from office B. A translator common to all intertoll markersmay be provided for all areas to which there is a single group oftrunks. The aforementioned McKim-Myers patent discloses both tollcompleting and intertoll trains of switches for connecting incomingtrunks with outgoing trunks to local and toll ofces and discloses amarker which may be either a toll completing marker, an intertollmarker, or a combined toll completing and intertoll marker. Referencemay also be had to the patent to Strickler No. 2,283,395, granted May19, 1942, for disclosure of a register-sender arranged to give to themarker the particular code digits which determine the routing of thecall and tell the marker which of a plurality of translators is to beused in connecting the calling incoming trunks to an idle outgoing trunkin a desired trunk group.

Assume now that a toll call has been initiated over intertoll trunk I bythe interconnection of cord Il and outgoing trunk circuit I4 and thatthe associated incoming trunk circuit I6 has been connected to theregister-sender Il. When the key-set at position I2 is operated totransmit the required code and numerical digits for completing the call,the digit signals thus transmitted are received by the incoming pulsereceiving circuit 293 oi register-sender Il and are successivelyregistered under the control of sequence relays Etl to EIEl, inclusive,in the registers 2H to i225, inclusive, one digit on each registerbeginning With register 2li in the manner disclosed in detail in theaforementioned Hecht-Lundstrom- Taylor patent. As soon as three digitshave been registered, ground is connected to conductor 223 to eiect theoperation of relay 40G and thereby cause the release of relay 401, relay40| having been operated at the time of the connection ofregister-sender I'l to trunk circuit IS. The release of relay dillcauses the operation of relay 452, whereby battery is connected toconductor 453 to effect the operation of the sender preference relay 439and sender connector relay 4H) in an idle marker-connector as describedin detail in the aforementioned King-McKim-Myers patent. IThe operationof relay 4I@ closes a circuit for operating the auxiliary senderconnector relay 355 and closes a circuit for operating a translatorpreference relay 425 associated With an idle pretranslator I9, thiscircuit being traced from battery through a front contact of relay 432,conductor 493, a back contact of relay 495, contact M4 of relay dit andwinding of relay 425 to ground. rlhe broken line connections to thewinding of relay 425 represent other relay contacts similar to thoseshown in detail in the operating circuit of a marker preference relay inthe aforementioned King-McKim-Myers patent. The operation of relay 425causes the operation of relay 435 whereby the register-sender I'I isconnected through contacts of relays 4m and 43D to the pretranslator I5.Each of the contacts llII, 4I2 and M3 of relay 4&3 and contacts 43|, 432and 433 of relay 433 represents a set vof four contacts through whichthe registers of the sender are connected to the registers of thepretranslator. |lhus the A, B and C registers of the pretranslator I9are set to correspond to the setting of registers 2H, M2 and 2I3 of theregistersender. Relay liti represents one of the translator hundredsrelays and relay 552 represents one of the translator tens relays, thetranslator being similar to the translator of a toll completing orintertoll marker as disclosed in detail in the aforementionedKing-McKiin-Myers patent. Seven route relays 533 to 539, inclusive, areshown. The route relay 553 corresponds to route code 243 and the otherroute relays may correspond to codes such as 425, 353, 762, 5I5, Slt and4M, respectively. The operating circuit of the route relay 593 for route243 is shown and a similar operating circuit is closed for each of theother route relays when the corresponding route code is registered.

While the route relays of the pretranslator `I9 are operated in similarmanner to that in which the route relays :of a marker are operated, theoperation of a route relay of the pretranslator is not eiective tocontrol the operation of cross bar switches but merely serves to givethe register sender information as to the class of the call. Codeterminals, one for route are provided for cross-connection to classterminals, one for each different class of call. Route relays 5113 and505, corresponding to codes 243 and 353, represent local ofiiccs towhich calls are routed directly from toll oiice B; and both of theassociated code terminals 523 and 525 are cross-connected to classterminal 535. Route relaysl'and't, corresponding to codes 436 and '152,represent local oces which are reached through the saine toll office toWhich there is a direct group of trunks from oflice B; and both of theassociated code terminals 524 and 525 are cross-connected to classterminal 536. Route relay 501, corresponding to code I5, represents atoll area to which there are a plurality of direct trunk groups, thetrunks in,

each group terminating in a different toll office; and the associatedcode terminal 52? is cross-con nected to class terminal 531. Route 508,corresponding to code 3|6, represents an area which is reached over asingle direct group of trunks; and the associated code terminal 528 iscross-connected to class terminal 538. Route relay 509, corresponding tocode 4|4, represents an area to which there is no direct group oftrunks; calls to this area are routed through a group of direct trunksto an intermediate toll oiiice and the assou ciated code terminal 529 iscross-connected to class terminal 539.

Assume iirst that the code, registered on the rst three registers of theregister sender and transferred to the A, B and C registers of thepretranslator, is the code 243. With the hundreds relay 50| operatedunder the control of the A register, and the tens relay 592 operatedunder control of the B register, a circuit is closed from ground in theC register for operating route relay 503. The operation of relay 503connects ground to code terminal 523, thence through class terminal 535,contact 435 of relay 430 and contact 4|5 of relay 4l@ to effect theoperation of class relay 450 in the register sender. Relay 453- locksand closes circuits for operating relays 499, 455 and 340. Relay 499locks, opens the circuit energizing the winding of translator preferencerelay 425 and closes a circuit for energizing the Winding of markerpreference relay 369. The release of relay 425 causes the release ofrelay 430 thereby disconnecting the register sender from thepretranslator. The circuit for operating marker preference relay 369 istraced from battery through the front contact of relay 402, a frontcontact of relay 499, a front contact of relay 455, contact 368 of relay360 and the Winding of relay 359 to ground. The operation of relay 359closes a circuit for operating relay 303 whereby the control conductorsfrom the A, B and C registers 2I I, 2|2 and 2I3 of the register senderare connected through contacts 34|, 342 and 343 of relay 340, contacts36|, 362 and 353 of relay 360, and contacts 38|, 382 and 383 of relay385 to the A, B and C registers oi the toll completing marker 20. Eachof the contacts 34|, 342 and 343 of relay 340, each of the contacts 35|,352 and 353 of relay 360 and each of the contacts 33|, 392 and 383 ofrelay 330 represent a set of four contacts through which the A, B and C`registers of the register sender are connected to the A, B and Cregisters of the marker. Thus the registers of the marker 20 are set toregister the same digits which were transmitted to the pretranslator.The marker 20 thereupon controls the selection of a trunk in a group oftrunks leading directly to the called local office and the establishmentof the connection through the toll completing train of switches betweenthe incoming trunk circuit I6 and the selected outgoing trunk circuit.On such a call the register sender transmits over the outgoing trunk thesucceeding digits registered in the register sender, which digits arenumerical digits of the called subscribers number. These digits aretransmitted by the outgoing pulsing circuit 300 under the control of thesequence relays .beginning with relays 3I4 and 324 in the mannerdescribed in detail in the aforementioned McKim-Myers patent. Thecircuit for operating relays 3 I4 and 324 is traced from battery throughthe windings of these relays in series, through a back contact of relay325, conductor 49|, back contact of class relay 490, to ground at a backcontact of relay 450.

Consider next a call on which the code registereol on the A, B and Cregisters of the register sender il and transferred to the registers ofthe pretranslator I9 is a code which effects the operation of the routerelay 505. The operation of relay 593 connects ground to code terminal52S, thence through class terminal 535, Contact 435 of relay 435 andcontact 4I5 of relay 4&3 to operatively energize the winding of classrelay 450 in the register sender. Relay 450 locks and closes circuitsAfor operating relays 499, 455 and 340. Relay 499 locks, opens thecircuit energizing the winding of translator preference relay 425 andcloses a circuit for energizing the winding of marker preference relay355, The release of recauses the release of relay 430 so as todisconnect the register sender from the pre- Jtranslator. The circuitfor operating marker preference relay 355 is traced from battery throughthe front contact of relay 402, a front contact of relay 493, a backcontact of relay 4'55, a iront contact of relay 455, contact 354 ofrelay and the winding of relay 355 to ground. The operation of relay 335closes a circuit for operating relay 373 whereby the control conductorsfrom the A, B and C registers 2li, 2|2 and 2|3 of the register senderare connected through contacts 534i, 342 and 343 of relay 349, contacts35|, 352 and 353 of relay 360 and contacts 35|, 372 and 343 of relay 373to the A, B and C registers or an intertoll marker 30. Each of contacts33|, 332 and 343 represents a set of four contacts through which theregisters of the inter-toll marker are connected to the registers 0i theregister sender. Thus the same digits that were registered in thepretranslator are registered in the intertoll marker; and, with both ofrelays and @I9 normal, the common translator 53 is used to effect theoperation oi a route relay and thereby select an outgoing trunk in agroup leading directly to the terminating toll oiiice which is in thesame toll area as is office B. The operated route relay elifects theconnection of the incoming trunk circuit I5 through the intertoll trainof switches to the selected outgoing trunk circuit. On such a call thereare only seven digits registered in the register sender, these digitsbeing the local oflice code and numerical digits of the calledsubscribers number. rIhese digits are transmitted under the-control ofthe seeuence relays beginning with relays 3l I and 32| as abovedescribed. With relay 450 operated, ground is connected to conductor 492to operate sequence relays 3|! and 32| instead of relays 3M and 324 asabove described; wherebyv the transmission of digit impulses starts withthe digit registered on the A register and all seven digits aretransmitted over the selected outgoing trunk.

Assume next a call on which the code registered on the A, B and Cregisters of the register sender il and transferred to the registers ofthe pretranslator I9 effects the operation of the route relay Relay 552iconnects ground to code terminal 527i, thence through class terminal531, Contact 43'! of relay 430 and contact 4l? oi relay 'SI5 tooperatively energize the winding of class relay 479 in the registersender. Relay MI5 locks and closes a circuit for operating relays 499and 'antrace 350'. vRelay 499 locks and opens the circuit for energizingthe winding of marker preference relay 425; and therelease oi relay 425causes the release oi relay 430, whereby the pretranslator |9 isdisconnected from the register sender l1. The register sender i1 is notconnected to a marker after the pretranslator is released until anadditional three digits have been registered in the register sender,these three digits being the local olice code digits which are to betrans- Initted to the marker ior use in selecting the trunk groupthrough which the call is to be completed. When the F register 2|5 hasbeen set and class relay 410 is operated, a circuit is closed fromground through the lowest iront contact of relay 41D, conductor 412, afront contact of one or more of the register relays of the register 2l5, conductor 226 and winding of relay 4'65. Relay 465 is thus operatedafter the local oii'lce code digits have been registered and closes thecircuit for operating the marker preference relay 365 as above describedto effect the operation ci relay 310. With relays 355 and 315 operated,the D, E and F registers ci the register sender are connected throughcontacts 35|, 352 and 353 of relay 359, contacts 36|, 362 and 363 ofrelay 359 and contacts 31|, 312 and 313 oi relay 315, to the A, B and Cregisters of the intertoll marker so that the registers of the markerare set in accordance with the local oflice code digits regisn t'ered inthe register sender. The operation of relay 319 also closes a circuitfor operating relay 6|() in the marker 39, the circuit for operatingrelay SIU being traced through contact 251i of relay 310, contact 351 ofrelay 359, conductor M3 and a iront contact of class relay 413. Theoperation of relay 6|!) connects the A, B and C registers of marker 39to the area translator 3|, this translator being used for all callsoutgoing to a particular toll area into which there are a plurality ofdirect groups of trunks, the particular group of trunks over which acall is to be routed depending on the local ofce code. Relay BEI] issimilarly operated in case the class relay operated by the pretranslatoris one which indicates that the area translator 32 is to be used on acall. A route relay is operated which eects the -connection of theincoming trunk circuit i through the intertoll train of switches to ancutgoing trunk circuit in a group which leads to a toll oflice in thecalled toll area through which toll oce the called local oiiice isaccessible over a direct group of trunks. On such a call the localoffice code and numerical digits registered in the register sender aretransmitted over the selected outgoing trunk under the control of thesequence relays beginning with relays 3 i and 325i.

Assume now a call on which the code registered on the A, B and Cregisters of the register sender l1 and transferred to the registers ofthe pretranslator i9 eiects the operation of route relay 568. Relay 508connects ground to code terminal 428 thence through class terminal 538,contact 438 of relay 430 and contact 4| of relay 4H) to operativelyenergize the winding of class relay 480 in the register sender. Relay489 locks and closes circuits for operating relays 499, 495 and 340whereby the A, B and C registers of the register sender are connected tothe registers of an intertoll marker 35 in the manner hereinbeforedescribed. The registers of marker Sil are connected to the commontranslator 33, whereby a rout-e relay is operated to effect theselection of a trunk in a group leading directly to the called tolloffice. If the trunk is a ring-down trunk,

the operated route relay does not cause the trans"-l mission of any ofthe digits registered in the register sender. But if the trunk is a dialtrunk, the operated route relay causes the transmission oi the localoiiice code and numerical digits registered in the register sender underthe control of the sequence relays beginning with relays 314 and 324 ashereinbefore described.

Assume now that the call is one on which the code registered on the A, Band C registers of the register sender |1 and transferred to theregisters of the pretranslator I9 effects the operation of route relay559. Relay 509 connects ground to code terminal 529, thence throughclass terminal 539 to operate relay 540. Relay 545 closes circuitsthrough contacts 438 and 439 of relay 43B and contacts 4|8 and 4|9 ofrelay M5 for operating class relays 480 and 49D. The operation of relay480 causes the operation of relays 499, 465 and 34|] whereby the A, Band C registers of the register sender are connected to the registers ofan intertoll marker 39 and the marker registers are connected to thecommon translator 33 as hereinbefore described. The

operation of the route relay corresponding to the toll code digitseiects the selection of a trunk in a group of trunks outgoing to anothertoll oince through which the called toll oiiice is accessible, and it isnecessary to send to the intermediate toll oilce not only the localoflice code and numerical digits but also to send the toll code digitsto enable the further routing of the call. To this end, the class relay490 disconnects ground from conductor 49| to prevent the immediateoperation of the sequence relays 3|4 and 324 and connects ground toconductor 492 to` cause the operation of sequence relays 3|| and 32|, sothat the sending of digits by the outgoing pulsing circuit 349 willstart with the digit registered on the A register of the registersender,

the succeeding digits rlegistered being trans-` mitted one after theother under the control of the succeeding sequence relays. Y

It is to be noted that whereas on a call on which route relay 551 of thepretranslator I9 is operated, the class relay 419 eiects thetransmission of only the local office code digits to the intertollmarker, the arrangement might be modiiied to have the toll code digitstransmitted to the intertoll marker to effect selection of thetranslator and th'en the transmission of the local office code digits tothe marker to effect the selection of a trunk and extension of theconnection thereto. This and other modifications may be made within thescope of the invention as defined by the claims.

What is claimed is:

1. In a toll ofce of a switching system comprising a plurality of tolland local onices, incoming trunks, outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks, a register-senderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits,

translating means effective to translate a pre-` prising a plurality oftool and local oices, incoming trunks, outgoing trunks, switching meansfor connecting incoming trunks with outgoing trunks, a register-senderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits, translating meanseective to translate a precien ter-mined number of digits each of anyvalue as soon as registered in said register-sender, markers eachincluding individual translating means for controlling the operation ofsaid switching means to connect a calling incoming trunk to an idleoutgoing trunk, means controlled by said iirstmentioned translatingmeans for immediately effecting the association of a marker with saidregister-sender and the transmission` of the saine digits to said markeras were transmitted to said rst-mentioned translating means.

3. In a toll ofce of a switching system comprising a plurality of tolland local oices, incoming trunks, outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks, a register-senderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits, translating meanseffective to translate a pre determined number of digits each of anyvalue as soon as registered in said register-sender, toll completingmarkers, intertoll markers, each of said markers including individualtranslating means for controlling the operation of said switchimT meansto connect a calling incoming trunk to an idle outgoing trunk, and meanscontrolled by said firstanentioned translating means for immediatelyeiecting the selective association of a toll completing marker or anintertoll marker with said register-sender.

4.a. In a toll office of a switching system cornprising a plurality oftoll and local oces, incoming trunks, outgoing trunks, switching meansfor connecting incoming trunks with outgoing trunks, a, register-senderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits, translating meanseiiective to translate a predetermined numher of digits each of anyvalue as soon as registered in said register-sender, markers eachincluding individual translating means for controlling the operation ofsaid switching to connect 9, calling incoming trunk to an 'die outgoingtrunk, and means controlled hy inst-mentioned translating means foreffecting the association of a marker with said register-sender as soonas an additional predetermined number of digits are registered in saidregister-sender.

5. In a toil ofiice of a switching system compricing a plurality of tolland local ofces, incoming trunk.: outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks, a register-senderconnected .to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits, translating meanseffective to translate a prec'letermined nur her of digits each ci anyvalue as soon as registered in said register-sender, markers eachincluding individual translating m ans for controlling .the operation ofsaid switching means to connect a calling incoming trunk to an idleoutgoing trunk, and means controlled by nrst-mentioned translating meanslor effecting the association of a marker with said register-sender assoon as an` additional predetermined number of digits 'are registered 10in said register-sender and for transmitting to said marker saidadditional digits registered in said register-sender.

6. In a toll oice of a switching system comprising a plurality of tolland local offices, incoming trunks, outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks, a register-senderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits, translating meanselTective to translate a predetermined number of digits each of anyValue as soon as registered in said register-sender, markers forcontrolling the operation of said switching means to connect a callingincoming trunk to an idle outgoing trunk, each of said markers includinga plurality of different translators, means in said register-sendercontrolled by said Erst-mentioned translating means for effecting theassociation of an idle one of said markers with said register-sender andfor effecting the selection of a desired one of said translators in theassociated marker.

7. In a toll cnice oi a switching system comprising a plurality of `tolland local offices, incoming trunks, outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks, a registersenderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits, .translating meanseffective to translate a predetermined number of digits each of anyValue as soon as registered in said register-sender, markers forcontrolling the operation of said svn'itching means to connect a callingincoming trunk to an idle outgoing trunk, each of said markers includinga plurality of different translators, means in said register-sendercontrolled by said first-mentioned translating means for efrect-ing theassociation of an idle one of said markers with said register-sender assoon as an additional predetermined number of digits are registered insaid register-sender, for eiecting the selection of a desired one ofsaid translators in the associated marker, and for transmitting to saidassociated marker said additional digits registered in saidregister-sender.

8. In a toll office of a switching system comprising a plurality of tolland local offices, incoming trunks, outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks, a register-senderconnected to a calling incoming trunk, said register-sender comprisingregisters for registering a plurality of digits and comprising means fortransmitting over a selected outgoing trunk a plurality of the digitsregistered, translating means effective to translate a predeterminednumber of digits each of any valueI as soon as registered in saidregister-sender, markers each including individual translating means forcontrolling the operation of said switching means to connect a callingincoming trunk to an idle outgoing trunk, and means controlled by saidnist-mentioned translating means for immediately eiecting theassociation of a marker with said register-sender, the transmission ofthe same digits to said marker as were transmitted to said rst-mentionedtranslating means, and for effecting, the transmission over the outgoingtrunk selected by said marker of all of the digits registered in saidregister-sender.

9. In a toll oce of a switching system comprising a plurality of tolland local oices, incoming trunks, outgoing trunks, switching means forconnecting incoming trunks with outgoing trunks,

lili alregister-senden connected-.to a calling: incoming trunk,` said:register-sender comprising registersfor registering a plurality ofdigitsand comprising mea-ns for transmitting over a selected` outgoingtrunk a pluralityfof the digits registered, translating;` meanseffective to translate a predeterminedv number of digits-r each of anyvalue as sooniasregistered-in said register-sender., markers foncontrolling the operation of said switching means-to.connect-a callingincoming trunk-to an' idleoutgoing ,trunk,.each of said markersincludingi a. plurality of different translators, means insaidpregister-sender controlled by'said rst-mentioned translatingmeans-for effecting the associationlof an idle one ofsaid markerswith'said register-sender and for effecting the selection of adesiredone of said translators in the associated markerand for effecting thetransmission over the.` outgoing trunk selected by said marker ofalleof. the digits registered in said .register-sender.

10. In atollofce of a switching system coinprisinga-:pluralityof tolland local offices, incoming trunks, groups of` outgoing trunks,switching means for connecting incoming-trunks with oui'- going trunks,aregister-sender connected to a calling-incoming trunk, saidregister-sender comprising registers for registering a plurality oidigits; pretranslators, means veffective to connect anidle.pretranslatorr to. saidy register-sender as soonasa/predetermined-number of digitshave been,registerecl insaidregister-sender, registers insaid pretranslator set inaccordancewith the setting ,or said .predetermined .number of registers o` theregister-sender, route relays in said pretranslator. and means foroperating a route relay corresponding.tofthe.setting of the re A'stersof said, pretranslaton. class relays inv said. registersender., .meansincludingltne operated route relay in said pretranslator for effectingthe operation ofgone or` more orsaidclass relays, toilcompletingmarkers.intertoll .markers, each.4 of said markers comprisingmeansincluding translating means for eieotingga connection between acallingincoming trunkandan idle outgoing trunk in a desiredgroupnitrunks, meanscontrolled -by an operated oneof-.said class relays.for connecting .the registersender to an idle..tolll. completing markerif. the callistobeextended oyer a trunk in a group out-- goingto.a.-,local. oflice, and means controlled by an .operatedoneof saidyclassyrelays for connectingthe .register-sender. to an idleintertollmarker ifltle call is to be extended.. over aI ltrunk in agroupfoutgoing to another. toll oice.

11'1. toll officev ofa switching system comprisingA aplurality ortoll.and local offices, incomingltrunks,T groups vof..; utgoing trunks,lswitching means .for` connecting incoming trunks withoutgoing trunks, aregister-sender' connected to a callingincoming trunk, saidregister-sender comprising. registers.. for. registering a plurality ofdigits, pretranslators, means effective to connect an idle.pretranslator to said register-sender as soon as a. predetermined numberof digits have been. registered in said' register-sender, registersinsaidpretranslator set in accordance. with the settingof said.predetermined number of registers otthe. register-sender, route relaysin said pretranslator and means for operating aroute relaycorrespondingy to the settingy of the registers of said pretranslator,class relays -in said' registersender., means. including theioperatedroute relay in saidpretranslator for eiecting the operation of oneor.moreofsaid class relays, toll completing markers, ,intertoll markers,each of said markers comprisingmeans for effecting a connectionbeinsaid'register-sender, pretranslators, means eftween-a callingincoming trunkand an idle outgoing trunk` in a desired groupot trunks,each of said intertoll markers comprising a plurality of differenttranslators, means controlled by an operatedY one of said class relaysfor connecting the register-sender to-an idle toll completing marker ifthe call is to be extended over a trunk in a group outgoing to a localoice, and means controlled by an operated one of said class relays forconnecting the register-sender to any idle intertollmarker if the callis to be extended over a trunk ina group outgoing toanotlier toll officeand for effecting the selection of the particular one of`said pluralityof translators which is capable of effecting the selection of an idletrunk in a particular group of trunks.

12. In a toll oflice of a switching systemcomprising a plurality of tolland local oflices, incoming trunks, groups of outgoing trunks, switchingmeans fory connectingincoming trunks with outgoing trunks, aregister-sender connected to a calling incoming trunk, saidregister-sender comprising registers for registering a plurality ofdigitsland means for transmitting over a selectedl outgoing 4trunk aplurality of the digits registered fective to connect an idlepretranslatorY so said register-sender as soon as a predetermined numberof digits have' been registered in said register-sender, registers insaid-pretranslator set in accordance with the setting ofsaidpredetermined number of registers of the register-sender, route relaysin said pretranslator and means for operating'aroute relay correspondingto the setting ofthe registers of said pretranslator, class relays insaidV register-sender, means including the operated route relay'insaid-pretransl-ator for effecting the operation of one or more of saidclass relays, t'oll completing markers, intertoll markers, each ofsaidmarkers comprising means including translating means for effecting aconnection between a calling incoming trunk and an idle outgoing trunkin a desired group of trunks, means controlled by anoperated one of saidclass relays for connecting the register-sender to an idle tollcompleting marker if the call is to be extended overa-trunk in a groupoutgoing to a local office, andmeanscontrolled by an operated one ofsaid class relays for connecting the register-sender to an idleintertoll'marker if the call is to be extended over a. trunk in a groupoutgoing to another toll oflice and for eiecting the transmission overthe selected outgoing trunk of all of the digitsre'gisteredin saidregister-sender following said-:predetermined number of digits in casethe selected outgoing trunk is in'agroup leading directly to theterminating toll oice through which the call isfrouted.

13.. In a-toll'oice of a switching system comprising a plurality oftolland local ofces, incoming trunks, groupsl of outgoing trunks,switching., means for connecting. incoming trunks with outgoing trunks,a register-sender connected to a callingfincoming-trunk, saidregister-sender comprising registersfor registering a plurality ofdigits and means for transmitting over a selected outgoing trunk aplurality of the digits registered insaid register-sender,pretranslators, means effective to connect an idle pretranslator to saidregister-sender as soon as a predetermined number` of digitshave beenregistered in said registersender, registers in said pretr-anslator setin accordance with the setting offsaid predetermined number of registersof the register-sender, routerelays.- in said pretranslator and meansfor operating a route relay corresponding to the setting of theregisters of said pretranslator, class relays in said register-sender,means including the operated route relay in said pretranslator foreffecting the operation of one or more of said class relays, tollcompleting markers, intertoll markers, each of said markers comprisingmeans including translating means for effecting a connection between acalling incoming trunk and an idle outgoing trunk in a desired group oftrunks, means controlled by an operated one of said class relays forconnecting the register-sender to an idle toll completing marker if thecall is to be extended over a trunk in a group outgoing to a localoflice, means controlled by an operated one of said class relays forconnecting the registersender to an idle intertoll marker if the call isto be extended over a trunk in a group outgoing to another toll officeand for effecting the transmission over the selected outgoing trunk ofall of the digits registered in said register-sender in case theselected outgoing trunk is in a group leading to an intermediate tollodce through which the call is routed to a terminating toll olce.

14. In a toll oiilce of a switching system comprising a plurality oftoll and local oiiices, incorning trunks, groups of outgoing trunks,switching means for connecting incoming trunks with outgoing trunks, aregister-sender connected to a calling incoming trunk, saidregister-sender comprising registers for registering a plurality ofdigits and means for transmitting over a selected outgoing trunk aplurality of the digits registered in said register-sender,pretranslators, means effective to connect an idle pretranslator to saidregister-sender as soon as a predetermined number of digits have beenregistered in said register-sender, registers in said pretranslator setin accordance with the setting of said predetermined number of registersof the register-sender, route relays in said pretranslator and means foroperating a route relay corresponding to the setting of the registers ofsaid pretranslator, class relays in said register-sender, meansincluding the operated route relay in said pretranslator for effectingthe operation of one or more of said class relays, toll completingmarkers, intertoll markers, each of said markers comprising means foreifecting a connection between a calling incoming trunk and an idleoutgoing trunk in a desired group of trunks, each of said intertollmarkers comprising a plurality of different translators, meanscontrolled by an operated one of saidvclass relays for immediatelyconnecting the registersender to an idle toll completing marker if thecall is to be extended over a trunk in a group outgoing to a local oiiceand for eiecting the setting of the registers of the toll completingmarker in accordance with the setting of the same registers of theregister-sender as controlled the setting of the registers of thepretranslator, means controlled by an operated one of said class relaysfor immediately connecting the register-sender to an idle intertollmarker if the call is to be extended over a trunk in a group outgoing toanother toll oice and the same digits are to be translated by the markeras were translated by the pretranslator, means controlled by an operatedone of said class relays for connecting the register-sender to anintertoll marker after an additional predetermined number of digits havebeen registered in said register-sender and said additional digits areto be translated by the marker to determine the group of trunks in whichan idle outgoing trunk is to be selected, means controlled by anoperated one of said class relays for selecting a particular translatorin the connected intertoll marker, and means controlled by a class relayfor selectively effecting the transmission over a selected trunk of allof the digits registered in said registersender following saidpredetermined number of digits or the transmission over a selected trunkof all the digits registered in said register-sender'.

MARTIN E. MALONEY, FRANK F. SHIPLEY.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS

